Electric incandescent lamp.



R. A. MAI-IAN.

ELECTRIC INGANDESGENT LAMP. APPLICATION FILBD'MAR.19,1914.

1, l 12,306, Patented Sept. 29,1914.

2 SHEETS-SHEET l.

e MMM# m R. A. MAI-IAN. ELECTRIC INCANDESGENT LAMP. APPLICATION New MAR.19,1914.

1,1 1 2,806. Patented Sept. 29, 1914.

2 SHEETS-SHEBT 2.

@noem/hoz ROBERT .ADONIS MAHAN, OF J ONESBORO, ARKANSAS.

ELECTRIC INCANDESCENT LAMP.

niiasoc.

i specification of Letters Patent.

Patented sept. 29, 1914.

Application tiled March 19, 1914. I Serial N o. 825,848.

T0 ZZ whom it may concern:

Be it known that I, ROBERT ADoNIs MAHAN, a citizen of the United States, residing at Jonesboro, in the county of Craighead and State of Arkansas, have invented certain new and useful Improvements in Electric Incandescent Lamps; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to improvements in electric lamp holders of that class designed for portable attachments of incandescent lamps for furniture and the like.

The object of the invention is to provide simple, effective, and quickly operated means for varying, regulating, or shutting off entirely the light of incandescent lamps and more especially to those which are arranged in horizontal position.

Another object is to provide a device of this character composed .of telescoping shade sections constructed to provide for the rotation of one section about the lamp relatively to the other to permit the passage of more or less light and to direct the rays thereof in any desired direction.

Another object is to provide a simply con-V structed and eliicient universal joint for electric lamps constructed to revolve and the socket to be adjusted and held at any desired angle.

With these and other objects in View, the invention consists of certain novel features of construction, and the combination and arrangementof parts, as will be more'fully described and claimed.

In the accompanying drawings :-Figure 1 represents a perspective View of what is known to the trade as a I-Iandy Light equipped with these improvements. Fig. 2 is a side elevation partly in section showing the lamp mounted on a shelf or similar support. Fig. 3 is a longitudinal section of the universal joint connection. Fig. 4 is an.,

enlarged sectional view of an incandescent lamp equipped with my improved shade. Fig. 5 is a transverse section thereof taken on the line 5 5 of Fig. 4, looking in the direction of the arrow. Fig. 6 is an enlarged sectional view showing the mounting of the lamp shade on the socket' thereof. Fig. 7 is a transverse section taken on the line 7-7, of Fig. 4e looking in the direction of the arrow. Fig. 8 is a detail sectional view of the supporting bracket.

In the embodiment illustrated, a lamp socket S of ordinary construction is shown having an incandescent bulb B mounted therein in the usual manner and on said socket 1s mounted my improved adjustable shield or lamp shade which comprises a fixed section 1 secured in any suitable manner preferably to the inner face of an annular flange or supporting bracket B carried by the socket S, such as is usually employed for supporting shades for incandescent lamps. This section 1 may be composed of any suitable material and corresponds in shape with the outline of the lamp globe being substantially semi-pearshaped and preferably hav ing its edges curled or flared outwardly, as shown clearly in Figs 4e and 5. On the outer face of this bracket B is formed an annular groove or seat 2 in which is revolubly mounted a metal band 3 to which is secured a movable shade section 4e, similar in shape to the section 1, the side edges of which are also fiared'in the manner similar to those in the section and which is slightly larger than said section 1 and is adapted to be telescopically engaged therewith as shown clearly in Figs. 4 and 7. From the above description, it will be obvious that the outer section 4 may be moved around the lamp relative to the section 1 and may overlap it a greater or less extent to vary the quantity of light permitted to be radiated from the lamp, or if desired, it may be entirely closed as shown in Fig. 5 for completely shutting off the light. vThe socket S is also revolubly mounted, as is usual in lamps of this character to permit the turning of the fixed section to vary its angles for changing the direction of the light rays from the lamp.l This socket S is adapted to be connected with a supporting bracket b by a universal joint shown clearly in Figs. 2, 3 and-7, and by means of which said lamp. may be disposed in planes at right angles to. each other, if so desired.

The bracket o, which is the bracket now on the market in connection with lamps of spring mounted within the bracket b, is shown clearly in Figs. ,1 and 2, said spring being shown in detail in Fig. 8 in the form of a U-shaped member having coils 6 and 7 at the free ends of its legs which are provided with laterally extending arms 8 for engagement with suitable sockets in the bracket b, the IU-shaped portion of said spring being adapted to coperate with the lower jaw of the bracket b for. clamping between them any article to whichthey may be adapted.

In Fig. 3, the improved universal joint used in connection with a lamp of this character is shown in detail in which 10 represents an outer thimble or casing having a bore 11 extending longitudinally therethrough and enlarged at its opposite ends as shown at 12 and 13 forming shoulders 14 .and 15 vfor a purpose to be described. This easing 10 is designed to be connected to the bracket b or other suitable bracket by means of a clamping member 16 which isadapted to'be threaded into the chamber 12, an annular head 17 extending laterally from its outer end between which and the outer end of the` casing 10, the bracket is designed to be clamped, the clamping member 16 having first been passed through an aperture formed in said bracket for the attachment of the lamp. A lamp engaging member 18 is connected with the casing 10 and is constructed in'the form of atubular thimble 19 adapted to be extended through the bore .11 of the casing 10 and held in operative i engagement therewith by means of a headed bolt 20, the head of which isdisposed in the chamber 12 and abuts against the shoulder '14, the shank passing through the thimble 19 beyond its outer end and there provided with la securing nut 21, which is arranged between two longitudinally extending lateral ears 22 and 23 between which a shank 24 connected with the socket S is designed to extend and to be pivotally connected by means of a bolt or other suitable member 25.

The member 18 has a head 26 formed at the 'upper end of the thimble 19 and which is designed to t in the chamber 13 of the casing 10, and is adapted to be revolved in said casing on the bolt 20. This head 26 has an annular flange 27 which is designed to overlap and rest on the .outer end of the chamber 13, the inner face of said head forming a shoulder or abutment against 'which one end of a coil spring 28 is `designed to bear, said spring 28 being arranged around vthe thimble 19 within the chamber 13 and bearing at its other end against the shoulder formed by the inner endl wall of said chamber' 13. This spring 28 exerts its tension to force the member 18 outward, thereby causing the head 20 of the bolt to frictionally engage the shoulder in the chamber 12 formed by the inner wall vresilient and are adapte of said chamber, and thereby yieldably hold the lamp connecting member 18 in adjusted position, permitting it to be turned in any desired direction.

The ears 22 and 23 are referably slightly A d to bindingly engage the shank 24 to hold the lamp socket at any desired angle between them.

From the above description, it will be obvious that by the use of this improved universal joint, the lamp mounted in the socket S may be adjusted in planes at right angles to each other to position it so that it will throw its light rays in the desired direction.

In the use of this improved holder, the bracket b to which it is attached may be engaged with a shelf s or any other suitable support as shown in Fig. 2 and the lamp mounted on said bracket may be adjusted at any desired angle. justed to the desired position, the bracket B may be turned to position the fixed shield or shade 1 at the point desired and the telescoping or movable shade section Ll may be ,turned to admit more or less light from the bulb B as may be desired.

The cord carrying the conducting wires preferably enters the socket D through one side thereof, as is shown clearly in Figs. 2 and 7, a small insulating socket S being arranged in the opening in the socket D through which said cord enters. By so arranging the cord, the necessity of its being connected with the universal joint or lamp connecting element is avoided.

' From the above, it will be obvious that this improved shield or shade may be very quickly adjusted, a simple twist o1 the bracket B in one direction carrying both shields and then a backward twist of the band 3 carrying the shield section 4 bein all that is required to adjust these shields. Ihe object of this improved shield or shade is to concentrate the light, and the sections thereof may be constructed of brass, steel, aluminum, or any other desired material, and may be secured in any desired manner to the band 3 and bracket B.

Having thus described my invention, what I claim is 1.,An incandescent lamp having a shade bracket mounted thereon, a hollow semipear-shaped shield section fixed to said bracket, a band revolubly mounted on said bracket, and a similarly shaped shield section secured to said band, revoluble therewith and adapted to telescopically and laterally engage the other section.

2. An incandescent lamp socket having an annular shade bracket mounted to revolve on said socket, a shade section fixed to the inner face of said bracket, said bracket having an annular seat in its outer face, a band `revolubly mounted in said seat, and a shade When it has been ad' section fixed to said band said sections conforming to the shape of an electric light bulb and adapted to telescope laterally.

3. The combination with a supporting member, and an incandescent electrlc lamp socket having a shank, of a universal joint v connection between said Socket and support comprlsing a tubular casing having a reduced central portion with enlarged chambers at its opposite ends, means for securing one end of said casing to said support, a lamp connecting element having a thimble at one end fitting in the reduced portion of said casing with a head revolubly mounted in the outer end of said casing, a coil spring arranged around said thimble in said chamloer at the outer end of said casing, a binding element mounted in said casing and engaging said thirnble, and means at the outer end of said connecting element for frictionally engaging the shank of said socket.

4. The combination with `a supporting member and an incandescent lamp socket V having a shank, of a universal joint connection between said socket and support comprising a tubular casing having a reduced central portion with enlarged chambers at its opposite ends, means for securing said casing to said supporting member, a lamp connecting memberv having a thimble extending into the reduced portion of said casing, and a head fitting in the outer chamber thereof, a coil spring arranged in said chamber between said head and the inner end wall of said chamber, a headed bolt extending through said thimble with the head thereof engaging the inner end Wall of the chamber at the inner end of said casing, and laterally spaced longitudinally extending apertured clamping ears at the outer end of said lamp connecting element, and means for connecting said ears to' the shank of said socket.

In testimony whereof I have hereunto set my hand in presence of two subscribing wit- ROBERT ADONIS MAHAN. Witnesses:

E. L. CRAIG, M. KU'LTUN.

'DESSGS- 

